David heer



D. H EER.

Lathes.

No. 141,347, Patented my 29, 1873.

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lvrr STATES arr:lvlLQELFIQEL DAVID HEER, OF PHILADELPHIA, PENNSYLVANIA,ASSIGNOR TO HENRY D. HIRST, OF SAME PLACE.

IMPROVEMENT IN LATHES.

Specification forming part of Letters Patent No. 141,347, dated July29,1873; application tiled April 5, 1873.

` To all whom Ait may concern:

The object of my invention is to enable av series of spirals or flutingsto be rapidly and automatically cut upon the surfaces of cylindrical orconical objects, such as chair-rounds, tassel-tops, &c., and Iaccomplish this object by the use of the machine shown in theperspective view, Figure l, of the accompanying drawing, the mainpeculiarities of which are a carriage, A, carrying a series offlirting-cutters, B, and having an arm, D, a projection or projectionson which enter the spiral grooves of a revolving former, E, on thedriving-spin dle F, the carriage being thus caused to move in thedirection of the arrow, so as to carry its cutters, which are forced andheld outward by a fixed cam, fast and in contact with the rotatingtassel-top or other object to-be fluted, the latter being retainedbetween the drivingspindle and a rod, F', as in a lathe, and beingautomatically released, when completed, by an arm, Gr, of the carriage,which strikes and releases certain retaining devices by which the rod F'is held against the said tassel-top, and after the drawing back of thecutters the whole carriage is, by action of a spring, restored to itsoriginal position, owing to the withdrawal of its arm D from the formerE, which is automatically accomplished by the striking of a trigger, a,against a fixed projection, b. v

The construction and operation of the machine will be fully understoodfrom the following detailed description.

'Ihe carriage A slides upon guides c of the frame, directly beneath thedriving-spindle F, and is constantly acted on by a spring, d, tending todraw it back, or in a direction contrary to that indicated by the arrow.On the driving-spindle there is a former, E, having spiral grooves cutupon it corresponding to the character of the ilutings which it isdesired to cut in the tassel-top or other object, and into these groovesextends a projection or projections on the under side of an arm, D, hungto the carriage at c, constantly acted on by a spring, c',

tending to raiseit, and held down by means of a spring-trigger, a, alsoattached to the carriage.

The cutters B, of which there are four in the present insta-nce, areattached to levers B' hung to a projecting-head, A', of the carriage, asbest observed in the enlarged views, Figs. 2 and 3. Each of these leversis independent of the others, and is acted on by a spring, f, tending todraw its cutter back from the work, the latter, shown at X, being in thepresent instance a tassel-top, secured to and rotating with the spindleF, and held against the same by the end pressure of a rod, F', as in alathe.

When the arm D is lowered onto the former E, and the machine started,the projections of the said arm will be carried through the spiralgrooves of the former, and the carriage will be consequently movedforward in the direction of the arrow, the arms h of the levers Bstriking a cam-like incline, t', on the fixed frame, and being turned bythe same until their cutters B are forced outward toward the tassel-top,against which they are held by a Xed projection, fi', of the frame,until they have passed the tassel-top and cut the required ilutings inthe same, the character of these flutings being determined by thecharacter of the grooves in the former E, from which the longitudinalmovement of the carriage and cutters is derived. After passing thetasseltop and fixed projection fi', each cutter, owing to the action ofthe spring upon its lever, drops back to its original position, as shownat the left-hand side of Fig. 2 and in Fig. 3; and after the drawingback of all ofthe cutters, which occurs on the completion of the ilutingoperation, an arm, G, of the carriage, which still continues its forwardmovement, strikes and pushes back a trigger, j, thus releasing andpermitting the elevation of a spring cam-lever, K, the pressure of thelatter against the rod F' being thus relieved and permitting the same tospring away from and release the tassel-top. 'lhe carriage stillcontinues its forward movement until the trigger a strikes a fixedprojection, b, when the said trigger is pushed back sufficiently torelease the arm D and permit the same to spring upward from the formerE, the carriage, as soon as this occurs, being drawn bodily backward toits original position by the action of the spring d before referred to,the arms h of the cutter-levers during this rearward movement passingbehind the xed projection i' and its incline z', the latter, as bestobserved in Fig. 4, being of the nature of a spring, so that it mayyield and permit the passage behind the same of the said arms. After therestoring of the parts to their original positions another tasseltop, orequivalent object, is adjusted between the centers, and the work goes onas before.

The head A', to which the cutter-levers are hung, is pivoted to thecarriage A, as shown at s, Fig. 3, which is an important feature, as itenables the angie ofthe cutters in respect te the Work to be altered, asrequired, to suit the character of the work.

Iclaim as my invention- 1. The combination, with a i'ormer,'E, of acarriage operated by the former, and provided with a series ofindependent cutters, B, attached to levers B', and adjustable to andfrom the Work, substantially as set forth.

2. The combination, with the carriage, oi' the head A', carrying thecutter-levers, and adjustable on a vertical axis, s, as and for thepurpose set forth.

3. The combination, substantially as described, of the saidcutter-levers B with the Witnesses THoMAs MCILVAIN, HUBERT HoWsoN.

